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fleetd #635 follow-up: refuse empty --set values, gitignore backups, preserve file mode
Five fixes against PR #636, all verified by the lead's own review and reproduced here:

1. --set .a.b= (a forgotten value) is now refused outright instead of silently nulling the
   field — a null numeric config value falls back to its default rather than erroring, which
   widens capacity silently instead of failing loudly. A deliberate clear gets its own spelling,
   --set .a.b=null, which writes a literal YAML null via yq, never through strenv(). (criteria
   9, 10)

2. Backups move from beside fleetd.yaml to a dedicated fleetd/.config-backups/ directory,
   gitignored at the repo root (so it also covers scripts/test-config-edit.sh's own throwaway
   fixtures) and in fleetd/.gitignore, plus a fleetd.yaml.bak.* glob backstop for any stray
   backup written the old way. A backup of a file that must never be committed inherits that
   requirement. (criterion 11)

3. The live config's file mode now survives both an edit and a restore. mv from a mktemp
   candidate used to carry mktemp's 0600 onto the live path forever, and cp onto an existing
   file keeps the destination's mode, so a restore did not undo it either. (criterion 12)

4. A global CAND + single EXIT/INT/TERM trap prevents an uninstalled .config-edit.XXXXXX
   candidate from leaking if the script is interrupted mid-run. No acceptance criterion is
   gated on this — a reproducible leak could not be made to happen on demand — but it is cheap
   and obviously right.

5. Acceptance criterion 7's redaction check gained a positive control: it now asserts the
   output actually CONTAINS the redaction marker and the changed key, not only that it lacks
   the secret. The prior two assertions were negative-only and passed just as happily when the
   diff was never printed at all — confirmed by reproducing the lead's own mutation (deleting
   the redacted diff print on the edit path) and watching it survive the old test and get
   caught by the new one. (criterion 13)

All 13 acceptance criteria plus 3 extras pass in scripts/test-config-edit.sh. Criteria 9, 10,
11, 12 and 13 were each proven non-vacuous: criteria 9/10 by mutating the test's own expected
value and watching it fail by name, then reverting; criteria 11/12/13 by reverting or mutating
the corresponding fix in config-edit.sh and watching the matching criterion fail by name, then
restoring the fix and re-confirming a clean pass.
2026-10-01 18:07:12 +02:00

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# Build output
target/
dependency-reduced-pom.xml
# Local runtime config (copy from fleetd.example.yaml). Both names are ignored: fleetd.yaml is
# the current name, and bridged.yaml is the legacy name Fleetd still falls back to.
fleetd.yaml
bridged.yaml
# fleetd #635 follow-up — scripts/config-edit.sh's backups of fleetd.yaml. A backup of a file
# that must never be committed inherits that requirement. The directory is the real protection
# (it keeps working even if the backup naming changes); the glob is a backstop for a stray
# backup written the old way, directly beside fleetd.yaml, or by an older copy of the script.
.config-backups/
fleetd.yaml.bak.*
# CB-505 audit trail + daemon stdout/stderr — runtime records, never source
logs/
# Editor / OS
*.iml
.idea/
.DS_Store